BENDIX SR-1 SPRING BRAKE VALVE Руководство - Страница 5
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DOUBLE
CHECK
VALVE
FIGURE 9 - PARK APPLICATION
OPERATION - PARKING
If both systems #1 and #2 are intact and the park control
valve is placed in the "park" or exhaust position, the SR-1
valve supply of air pressure and the air pressure in the spring
brake actuator cavities is exhausted. The single check valve
in the SR-1
™
valve assists this exhaust of air pressure by
allowing the air below piston B to flow back out the open
exhaust of the park control valve. When air pressure below
piston B has dropped sufficiently, piston B moves down,
opening the inlet of valve B and providing an additional
exhaust passage for air exhausting through the SR-1
from the spring brakes.
PREVENTIVE MAINTENANCE
Important: Review the Bendix Warranty Policy before
performing any intrusive maintenance procedures. A warranty
may be voided if intrusive maintenance is performed during
the warranty period.
No two vehicles operate under identical conditions, as a
result, maintenance intervals may vary. Experience is a
valuable guide in determining the best maintenance interval
for air brake system components. At a minimum, the SR-1
valve should be inspected every 6 months or 1500 operating
hours, whichever comes first, for proper operation. Should
™
the SR-1
valve not meet the elements of the operational
tests noted in this document, further investigation and service
of the valve may be required.
SERVICE CHECKS
OPERATING CHECKS
Block all wheels and hold by means other than vehicle brakes.
Charge air brake system to governor cut-out pressure.
#2 SERVICE
RESERVOIR
#1 SERVICE
RESERVOIR
INLET &
EXHAUST A
PARK
CONTROL
™
™
valve
™
PISTON A
INLET &
EXHAUST
B
EXHAUST
SB-3
1. Place parking control valve in the "park" position. Observe
that the spring brake actuators apply promptly. In the
delivery port of the valve install a test gauge known to be
accurate. Place the parking control valve in the "release"
position. Observe that the spring brake actuators release
fully.
2. With the parking control valve in the "release" position,
note the gauge pressure reading. (Check the vehicle
manual for the correct spring brake actuator hold-off
pressure.) If the pressure reading is incorrect, the valve
must be repaired or replaced.
3. Place the parking control valve in the "park" position, the
gauge reading should drop to zero promptly. A slow
release of pressure may indicate faulty operation of the
single check valve (within the modulating valve.)
4. Place the parking control valve in the "release" position.
Locate the number one service reservoir and drain it
completely.
Apply the foot brake valve several times and note that
the pressure reading on the gauge decreases each
time the foot brake valve is applied. After several
applications, pressure on the gauge will drop to the point
where release of the spring brake actuators will no
longer occur.
LEAKAGE CHECK
With the air system fully charged and the parking control
valve in the "release" position, coat the exhaust port and
around the valve corner with a soap solution. Slight leakage
is permitted.
If the SR-1
™
spring brake valve does not function as described
above, or leakage is excessive, it is recommended that it be
repaired or replaced with a genuine Bendix service
replacement valve.
PISTON B
CHECK VALVE
5